This is my second spring with the unheated greenhouse, erected by a previous gardener. The first year I learned a lot about what would not grow in an unheated greenhouse in this maritime climate over winter. The amount of sunlight hours per day is key. The period between November 1 and February 15 is the cut off here for 10 hours of sunlight. I should not expect much growth with fewer than 10 hours. I learned that my salad greens will germinate if planted in the bed around February 1. This past winter was much more successful than the first as far as wintering over plants such as the Meyer Lemon, although the Brugmansia Datura looks dead to me. Very tropical. A $5.00 loss.